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-rw-r--r--arch/arc/include/asm/io.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arc/include/asm/io.h b/arch/arc/include/asm/io.h
index 72f7929736f8..94ef71b38b69 100644
--- a/arch/arc/include/asm/io.h
+++ b/arch/arc/include/asm/io.h
@@ -32,7 +32,7 @@ static inline void ioport_unmap(void __iomem *addr)
{
}
-extern void iounmap(const void __iomem *addr);
+extern void iounmap(const volatile void __iomem *addr);
#define ioremap_nocache(phy, sz) ioremap(phy, sz)
#define ioremap_wc(phy, sz) ioremap(phy, sz)